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A kind of preparation method of composite calcium carbonate

A technology of compounding calcium carbonate and calcium hydroxide, which is applied in chemical instruments and methods, dyeing polymer organic compound treatment, fibrous fillers, etc., can solve the problems of low coating rate, easy peeling, and difference in coating rate of titanium dioxide , to achieve the effects of simple production process, improved hiding power, and high UV absorption intensity

Active Publication Date: 2016-01-06
北京中互睿石新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention is that when there is no dispersant in the carbonization reaction process, the coating rate of titanium dioxide in the calcium carbonate-titanium dioxide particles is not high and is easy to peel off. The defect that the coverage rate of titanium dioxide in the product varies greatly

Method used

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  • A kind of preparation method of composite calcium carbonate
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Under the conditions of 40°C and a stirring speed of 800 rpm, add 7.4% rutile titanium dioxide and 0.074% polyethylene glycol or polyethylene two to the calcium hydroxide slurry with a mass fraction of 10%. Alcohol ester (molecular weight 1000), mechanically stirred for 30 minutes, and then at a rate of 120 liters / minute, a mixture of carbon dioxide and nitrogen in a volume ratio of 1:2 is introduced for carbonization reaction. When the pH of the solution is 7, the reaction is stopped. A white water slurry is obtained; the white water slurry is subjected to centrifugal dehydration and dried at 120°C for 4 hours.

[0018] The whiteness value of composite calcium carbonate is 96.3, the yield is 97%, and the coating rate of calcium carbonate is 94%. When observing the composite calcium carbonate with a scanning electron microscope, rutile titanium dioxide is coated on the surface of the calcium carbonate, and there is no separate titanium dioxide.

Embodiment 2

[0020] Under the conditions of 50°C and stirring speed of 800 rpm, add 11.1% of the calcium hydroxide mass and 0.296% of polyethylene glycol or polyethylene to the calcium hydroxide slurry with a mass fraction of 10%. Alcohol ester (molecular weight 2000), mechanically stirred for 40 minutes, and then at a rate of 90 liters / minute, a mixed gas of carbon dioxide and nitrogen with a volume ratio of 1:2 is introduced for carbonation reaction. When the pH of the reaction solution is 7, stop After the reaction, a white water slurry was obtained; the white water slurry was subjected to centrifugal dehydration, and then dried at 120°C for 4 hours.

[0021] The whiteness value of the composite calcium carbonate is 97.2, the yield is 98%, and the coating rate of calcium carbonate is 96%. When observing the composite calcium carbonate with a scanning electron microscope, rutile titanium dioxide is coated on the surface of the calcium carbonate, and there is no separate titanium dioxide.

Embodiment 3

[0023] Under the conditions of 50℃ and 900 rpm stirring speed, add 14.8% rutile titanium dioxide and 0.518% polyethylene glycol or polyethylene two to the calcium hydroxide slurry with a mass fraction of 15%. Alcohol ester (molecular weight 6000), mechanically stirred for 50 minutes, and then at a rate of 80 liters / minute, a mixture of carbon dioxide and nitrogen with a volume of 1:2 is introduced to carry out the carbonation reaction. When the pH of the reaction solution is 7, stop The reaction yields a white water slurry; the white slurry is subjected to centrifugal dehydration, and then dried at 120°C for 4 hours.

[0024] The whiteness value of the composite calcium carbonate is 96.8, the yield is 97%, and the coating rate of calcium carbonate is 94%. When observing the composite calcium carbonate with a scanning electron microscope, rutile titanium dioxide is coated on the surface of the calcium carbonate, and there is no separate titanium dioxide.

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Abstract

The preparation method of the composite calcium carbonate of the present invention belongs to the technical field of inorganic synthesis. The invention provides a preparation method of composite calcium carbonate, using polyethylene glycol or polyethylene glycol ester as a dispersant, adding titanium dioxide and a dispersant to calcium hydroxide slurry, and feeding carbon dioxide and nitrogen with a volume ratio of 1 : 2 mixed gas for carbonization reaction to obtain composite calcium carbonate. The obtained composite calcium carbonate product has a structure that the surface of spindle-shaped calcium carbonate particles is uniformly coated with titanium dioxide nanoparticles. The composite calcium carbonate prepared by the invention has the characteristics of high ultraviolet absorption intensity, high whiteness, strong hiding power and strong weather resistance, and has a bactericidal effect; the preparation method of the invention has the advantages of simple production process, mild reaction conditions and easy industrial production Features.

Description

Technical field [0001] The invention relates to the technical field of inorganic synthesis, in particular to a preparation method of composite calcium carbonate. Background technique [0002] As an important inorganic chemical raw material, calcium carbonate has the characteristics of abundant resource reserves, non-toxic, odorless, and excellent performance. It is widely used in coatings, plastics, papermaking, rubber, ink and other fields. Especially in the field of coatings, calcium carbonate has attracted more and more attention. In the water-based coating industry, calcium carbonate can prevent coatings from settling, so that the coating has good dispersibility and high gloss, and the amount of calcium carbonate in water-based coatings accounts for 20% ~60%. In the coating, calcium carbonate not only plays the role of skeleton, but also increases the thickness of the coating film, improves the wear resistance of the coating, and significantly improves the adhesion of the co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/36C09C3/06C09C3/10
Inventor 周兵李真黄春影刘忠甫
Owner 北京中互睿石新材料科技有限公司
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